Ok, so i have a niche that meets all the needs of the challenge. I can get a domain with the 2 keywords and 95% density by adding the prefix e.
For example ekeyword1keyword2.

Now it is keyword 2 that takes the competition down to under 30,000. Together, these 2 keywords are ok as the theme keywords But...

Just for fun I wanted to see what could be registered for only keyword1, where the competition is close to a million. It turns out I could get a .com with a 2 letter prefix that, together, actually sounds good as a brand. I'd like to purchase this domain because it makes more sense as the theme keyword.

So I have a few questions :

Can I use this prefixkeyword1 domain and then meet the challenge criteria by making the original keyword1keyword2 a Category keyword??

In other words, can I still rank on the front page for those 2 keywords, even if the domain name only includes the more general, higher SEOC theme keyword, by putting the 2 keywords in the articles, headlines, links etc.?

There are various ways to rank for category keywords that more experienced people know about and I am sure get discussed as part of the challenge. I need these experienced people's advice because I need to purchase the domain now to move on and want to know I can still drive traffic from getting to the front page of google with the lower SEOC category keywords, despite the theme keyword domain...

I don't want to buy the lower SEOC keywords category domain and then regret it when I get to the section of the Challenge where categories are discussed and then move everything over to the higher SEOC theme keyword domain because I find out that you can still rank for these category keywords with the later revealed techniques. Make sense?? Thanks